Lamp structure for lamp strings

Abstract

An improved lamp structure for lamp strings comprising a lamp bulb, a base, a socket and two conductors is disclosed. The base is provided therein with a receiving recess and has a lower portion thereof partially opened, so that when the lamp bulb is placed in the base, the lower end the lamp bulb is partially exposed. The socket is provided therein with pairs of ribs; they can forcedly press the base and the lamp bulb to fix their positions, and form an engaging groove to receive the metallic pins of the conductors. By this arrangement, the metallic pins of the conductors can electrically contact respectively two metallic wires of the lamp bulb. Therefore, the longitudinal size of the elements of the whole structure can be shortened to reduce cost of material in production, and thereby safety of the products can be elevated.

What is claimed is:  
     
       1. An improved lamp structure for lamp strings comprising: a lamp bulb, having two metallic wires extending downwards therefrom; a base, with a receiving recess provided therein to receive said lamp bulb, said receiving recess is formed from an upper portion that is a cylindrical wall and a lower portion that is a connecting portion of said base, said connecting portion on said lower portion of said base is a “U” shaped member having a narrower width to render a lower portion of said receiving recess to leave two partially opened spaces, said connecting portion is further provided on the bottom thereof with two through holes to permit extending of said two metallic wires of said lamp bulb therethrough for bending of said two metallic wires laterally; a lamp socket, being provided therein with a space of which the upper portion forms a receiving space for receiving therein said base, and of which the lower portion is tapered and forms a flat conductor groove, pairs of ribs are provided in said receiving space, wherein, at least two pairs of said ribs form engaging grooves together with the wall of said receiving space; two conductors, being provided on the ends thereof with metallic pins, said metallic pins are inserted into said flat conductor groove on the lower portion of said socket and being engaged in said engaging grooves, and contact said metallic wires of said lamp bulb. 
     
     
       2. An improved lamp structure for lamp strings as in  claim 1 , wherein, transverse size of said receiving recess of said base is smaller than the inner diameter of said receiving space of said socket, hence there are gaps between both lateral sides of said connecting portion and said receiving space, in order that said metallic pins of said conductors and said metallic wires of said lamp bulb are placed therebetween. 
     
     
       3. An improved lamp structure for lamp strings as in  claim 1 , wherein, said at least two pairs of said ribs provided in said receiving space are located near the ends of the two widest lateral sides of said flat conductor groove, the distances between every pair of protrusions of said two pairs of ribs equal to the width of said connecting portion of said base, this allows said ribs to abut against the four corners of said connecting portion. 
     
     
       4. An improved lamp structure for lamp strings as in  claim 1 , wherein, another pair of said pairs of ribs are located near the middle of the two lateral sides of said flat conductor groove and extend to the top of said flat conductor groove, said another pair of ribs have protrusions facing to exposed portions at the lover end of said lamp bulb, said another pair of ribs forcedly press said lower end of said lamp bulb. 
     
     
       5. An improved lamp structure for lamp strings as in  claim 1 , wherein, two vertical grooves are provided on said cylindrical wall of said upper portion of said base, said vertical grooves respectively engage another pair of said pairs of ribs extending upwardly to the top of said socket. 
     
     
       6. An improved lamp structure for lamp strings as in  claim 1 , wherein, length of said metallic wires extending downwardly from said lamp bulb is within the range of 5-8.5 mm. 
     
     
       7. An improved lamp structure for lamp strings as in  claim 1 , wherein, length of the longitudinal size of said base is within the range of 6-10 mm. 
     
     
       8. An improved lamp structure for lamp strings as in  claim 1 , wherein, the longitudinal size of said socket is within the range of 14-16.5 mm.